primary emission

primary emission

[′prī‚mer·ē i′mish·ən]
(electronics)
Emission of electrons due to primary causes, such as heating of a cathode, and not to secondary effects, such as electron bombardment.
References in periodicals archive ?
Exhaust gas recirculation is an established primary emission control technique for the effective suppression of NOx emission in reciprocating Internal combustion engines.
The five environmental indices that were created using primary emission data are discussed below.
It was impossible to predict quantitatively the intensity of primary emission or the signal losses due to the absorption of x-rays within the specimen.
Catalytic converters are the primary emission control device in a vehicle.
Point Carbon predicts primary Certified Emission Reduction (CER) volume, generated by CDM projects, of 300 Mt in 2009, down 45% on last year, and primary Emission Reduction Unit (ERU) volumes, generated by JI projects, of 40 Mt, down 44% on 2008.
When hydrogen is burned, the primary emission is water vapor.
Pollutants like sulphur and other particulate matter being primary emissions from fire crackers, studies have revealed that the maximum average of PM2.
Smog chamber experiments indicate that photo-oxidation of aircraft emissions produces significant amounts of secondary PM (particulate matter), which, under typical summertime conditions, exceed the primary emissions within minutes of the exhaust leaving the engine.
In the report, the group recommends that both primary emissions of PM and emissions of precursors to secondary PM be addressed.
Research has been conducted to improve methodologies for measuring primary emissions from a broad range of stationary and mobile sources and to evaluate post-emission gas to particulate conversions (42-44).
One-fourth of the primary emissions that lead to smog, one-third of the emissions that cause global warming and two-thirds of the emissions that contribute to acid rain can be attributed directly to electric power plants.